{"id":2048,"date":"2015-12-21T09:05:00","date_gmt":"2015-12-21T09:05:00","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=2048"},"modified":"2015-12-21T09:05:00","modified_gmt":"2015-12-21T09:05:00","slug":"introduction-to-covering-indexes","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/pt\/introduction-to-covering-indexes\/","title":{"rendered":"Introdu\u00e7\u00e3o aos \u00edndices de cobertura"},"content":{"rendered":"<h2>O que s\u00e3o \u00edndices de cobertura?<\/h2>\n<p>No mundo relacional\/SQL, \u00e9 poss\u00edvel economizar tempo de consulta com o uso criterioso de \u00edndices: se voc\u00ea tiver um \u00edndice em cada coluna que a consulta tocar, o DBMS poder\u00e1 retornar os resultados sem ter que mergulhar nas pr\u00f3prias tabelas.<\/p>\n<p>Esses s\u00e3o \u00edndices de cobertura.<\/p>\n<h2>O que s\u00e3o \u00edndices de cobertura no Couchbase?<\/h2>\n<p>O Couchbase Server 4.1 traz os \u00edndices de cobertura para o N1QL. Se voc\u00ea tiver um \u00edndice que cubra todos os dados exigidos pela sua consulta N1QL, o Couchbase Server poder\u00e1 retornar os dados diretamente desse \u00edndice. Isso elimina pelo menos uma, e possivelmente v\u00e1rias, leituras de documentos do processo de consulta.<\/p>\n<h2 style=\"margin-top: 0.7em; color: rgb(51, 51, 51); text-align: left;\">Como isso funciona?<\/h2>\n<p>Quando voc\u00ea envia uma consulta N1QL ao Couchbase, ela passa pelas seguintes etapas:<\/p>\n<ol>\n<li>Analisa sua consulta, analisa o que ela faz e, em seguida, cria um plano de consulta.<\/li>\n<li>Verifica os \u00edndices relevantes.<\/li>\n<li>Obt\u00e9m as chaves dos documentos que cont\u00eam os resultados e, em seguida, busca os pr\u00f3prios documentos.<\/li>\n<li>Extrai os dados relevantes desses documentos para criar o resultado.<\/li>\n<li>Retorna o resultado para seu aplicativo.<\/li>\n<\/ol>\n<p>Com um \u00edndice de cobertura, todos os dados do resultado est\u00e3o no pr\u00f3prio \u00edndice, portanto, voc\u00ea elimina as etapas 3 e 4.<\/p>\n<h2>Como uso os \u00edndices de cobertura?<\/h2>\n<p>Nada muda na forma como voc\u00ea escreve suas consultas. Em vez disso, o que importa \u00e9 como voc\u00ea configura os \u00edndices. Um \u00fanico \u00edndice - GSI ou visualiza\u00e7\u00e3o - deve abranger todas as chaves JSON que sua consulta tocar.<\/p>\n<h2 style=\"margin-top: 0.7em; color: rgb(51, 51, 51); text-align: left;\">Tem um exemplo?<\/h2>\n<p>Digamos que estejamos armazenando perfis de clientes. Eles podem ter a seguinte apar\u00eancia:<\/p>\n<p>{<\/p>\n<p style=\"margin-left: 40px;\">\"nome\": \"Sherlock Holmes\",<\/p>\n<p style=\"margin-left: 40px;\">\"endere\u00e7o\": \"221b Baker Street\",<\/p>\n<p style=\"margin-left: 40px;\">\"city\" (cidade): \"London\",<\/p>\n<p style=\"margin-left: 40px;\">\"country\": \"UK\",<\/p>\n<p style=\"margin-left: 40px;\">\"newsletter\": true,<\/p>\n<p style=\"margin-left: 40px;\">\"joinedDate\": 1168041600<\/p>\n<p>}<\/p>\n<p>Se quis\u00e9ssemos encontrar o nome e a cidade de todos os assinantes do nosso boletim informativo, poder\u00edamos escrever uma consulta N1QL como esta:<\/p>\n<pre>\nSELECT nome, cidade FROM `customers` WHERE newsletter=true;<\/pre>\n<p>Sem um \u00edndice de cobertura, essa consulta extrairia <em>nome<\/em> e <em>cidade\u00a0<\/em>de nossos registros de clientes, fazendo uma consulta a esses documentos.<\/p>\n<p>Podemos criar um \u00edndice de cobertura para essa consulta da seguinte forma:<\/p>\n<pre>\nCREATE INDEX newsletter_subs ON `customers`(name, city, newsletter) USING GSI;<\/pre>\n<p>Agora, a consulta pode ser satisfeita inteiramente a partir do \u00edndice.<\/p>\n<h2>Onde posso ler mais?<\/h2>\n<p>H\u00e1 um <a href=\"https:\/\/developer.couchbase.com\/documentation\/server\/4.1\/indexes\/covering-indexes.html\">se\u00e7\u00e3o sobre cobertura de \u00edndices na documenta\u00e7\u00e3o do Couchbase Server<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>What are covering indexes? In the relational\/SQL world you\u00a0can save query time by the judicious use of indexes: if you have an index on each column that your query touches then your DBMS can return the results without diving into [&hellip;]<\/p>","protected":false},"author":18,"featured_media":13873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"ppma_author":[8982],"class_list":["post-2048","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.9 (Yoast SEO v25.9) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Introduction to covering indexes - The Couchbase Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.couchbase.com\/blog\/pt\/introduction-to-covering-indexes\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Introduction to covering indexes\" \/>\n<meta property=\"og:description\" content=\"What are covering indexes? 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